For the foreseeable future, electrodes are disposable. The Crown's rubber electrodes are designed to last 800 uses!
We recommend rotating your electrodes about every two weeks of use. That means taking one electrode and swapping it with another electrode location; this can double or triple the lifetime of the electrodes.
When the tips of your electrode start to look black on most brushes, it's time to replace the electrode.
Electrodes can be swapped out with a finger nail or a flat plastic spudger.